Implications for the origin of secondary sylvite from a simulation of carnallite dissolution

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	Implications for the origin of secondary sylvite from a simulation of carnallite dissolution
	Cheng, Huai De; Hai, Qing Yu; Ma, Hai Zhou; Zhang, Xi Ying; Tang, Qi Liang; Fan, Qi Shun; Li, Yong Shou; Miao, Wei Liang
	2016-06-01
发表期刊	JOURNAL OF GEOCHEMICAL EXPLORATION
卷号	165 页码:189-198
关键词	Carnallite Flotation Separation Leaching Dissolution Potash Secondary Sylvite
摘要	The relationship between sylvinite (KCl + NaCl) and camallite (KCl center dot MgCl2.6H(2)O) is important in potash mines containing carnallite, and especially where sylvinite overlies carnallite. It is generally believed that this reversal of the normal depositional sequence may be caused by dissolution of carnallite. To obtain sylvite (KCl) from carnallite ore in the present study, first camallite ore dissolution was performed in an aqueous solution at 25 degrees C, and then the sylvite was separated from halite (NaCl) in the sylvinite by a flotation method. The Br and Rb concentrations in the sylvite derived from the carnallite ore were determined. The results showed that more than 4/5th of the Br and Rb in the carnallite ore transferred to the mother liquor, while the remainder of the Br and Rb was in the sylvinite. The sylvite separated from this sylvinite had purity of 94-96%. In the sylvite derived from carnallite, the Br concentration was obviously lower (by an order of magnitude) than the concentration in primary sylvite from evaporation of MgSO4-deficient sea water, and the Rb concentration was twice that in primary sylvite from evaporation of MgSO4-deficient sea water. Compared to the Br and Rb concentrations in secondary sylvite from Khorat Plateau, Sergipe, and Prairie evaporites, the concentrations in the sylvite derived from carnallite ore were similar. The redistribution of Br and Rb in the form of secondary sylvite was in a relative stable proportion according to the comparison of Br and Rb. The lower Br and higher Rb concentrations in sylvite derived from camallite ore could be caused by KCl re-crystallization and redistribution of Br and Rb between the solid and liquid phases. The driving force behind changes in the partition coefficients of Br and Rb is that the dissolution of carnallite is much slower than the nucleation of KCl. (C) 2016 Elsevier B.V. All rights reserved.
语种	英语
引用统计
文献类型	期刊论文
条目标识符	http://ir.isl.ac.cn/handle/363002/6319
专题	青海盐湖研究所知识仓储盐湖地质与环境实验室支撑部门
作者单位	Chinese Acad Sci, Qinghai Inst Salt Lakes, 18 Xinning Rd, Xining 810008, Qinghai, Peoples R China
推荐引用方式 GB/T 7714	Cheng, Huai De,Hai, Qing Yu,Ma, Hai Zhou,et al. Implications for the origin of secondary sylvite from a simulation of carnallite dissolution[J]. JOURNAL OF GEOCHEMICAL EXPLORATION,2016,165:189-198.
APA	Cheng, Huai De.,Hai, Qing Yu.,Ma, Hai Zhou.,Zhang, Xi Ying.,Tang, Qi Liang.,...&Miao, Wei Liang.(2016).Implications for the origin of secondary sylvite from a simulation of carnallite dissolution.JOURNAL OF GEOCHEMICAL EXPLORATION,165,189-198.
MLA	Cheng, Huai De,et al."Implications for the origin of secondary sylvite from a simulation of carnallite dissolution".JOURNAL OF GEOCHEMICAL EXPLORATION 165(2016):189-198.